People are taking one of those courses because universities in the USA are basically companies. As a result you get marketing to sucker people into buying stuff they dont need and cant afford.
That doesnt change the fact that we have those programs in the first place for the pursuit of knowledge in the hope that it will benefit society. That benefit doesnt have to be an economic one. A degree in your native language has arguably little financial value, but you only have to look to countries like France to see how much a society still collectively values their language.
Investing in universities is historically something nations afford themselves in the hopes it will be of benefit to society. The idea of individuals investing into themselves is a rather American one. I would argue the only reason a large amount of US universities exist is because they have a special tax status and people get to take special loans to pay for their services. Alternatively you would just have companies providing job training. From the outside it looks like much of the problems with the US system stems from purposefully not communicating that difference to new students
edit: To word it differently, the sole purpose of the teaching arm of a classical university is to enable the next generation to introduce novel ideas into their fields. Thats what a doctoral dissertation is. You advancing your field and adding to the collective knowledge.